JP7156495B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP7156495B2 JP7156495B2 JP2021501588A JP2021501588A JP7156495B2 JP 7156495 B2 JP7156495 B2 JP 7156495B2 JP 2021501588 A JP2021501588 A JP 2021501588A JP 2021501588 A JP2021501588 A JP 2021501588A JP 7156495 B2 JP7156495 B2 JP 7156495B2
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- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
- H01L29/7396—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions
- H01L29/7397—Vertical transistors, e.g. vertical IGBT with a non planar surface, e.g. with a non planar gate or with a trench or recess or pillar in the surface of the emitter, base or collector region for improving current density or short circuiting the emitter and base regions and a gate structure lying on a slanted or vertical surface or formed in a groove, e.g. trench gate IGBT
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Description
特許文献1 WO2017/155122号
特許文献2 特開2017-11001号公報
特許文献3 WO2015/068203号
特許文献4 特開2017-45949号公報
特許文献5 特開2012-69579号公報
Claims (21)
- 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の上面に接する領域に、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域を有するトランジスタ部と、
前記半導体基板の下面に接する領域において、前記ドリフト領域よりもドーピング濃度の高い第1導電型のカソード領域を有し、且つ、前記カソード領域以外の領域に第2導電型のオーバーラップ領域を有し、前記半導体基板の上面において、予め定められた配列方向で前記トランジスタ部と並んで配置されたダイオード部と、
前記半導体基板の上方に配置されたエミッタ電極と、
前記半導体基板と前記エミッタ電極との間に設けられ、前記エミッタ電極と前記ダイオード部とを接続するためのコンタクトホールが設けられた層間絶縁膜と
を備え、
前記配列方向において、前記カソード領域は、前記エミッタ領域の端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記エミッタ領域の端部と前記カソード領域の端部との間において第1の長さで設けられ、
前記配列方向と直交する延伸方向において、前記カソード領域は、前記コンタクトホールの端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記コンタクトホールの端部と前記カソード領域の端部との間において第2の長さで設けられ、
前記第1の長さは、前記第2の長さの5倍以上である半導体装置。 - 前記第1の長さは、20μm以上である
請求項1に記載の半導体装置。 - 前記半導体基板において、前記ダイオード部と前記延伸方向に並んで配置された、第2導電型のウェル領域を更に備え、
前記延伸方向において、前記オーバーラップ領域は、前記ウェル領域の端部と前記カソード領域の端部との間において第3の長さで設けられ、
前記第1の長さは、前記第3の長さよりも大きい
請求項1または2に記載の半導体装置。 - 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の上面に接する領域に、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域を有するトランジスタ部と、
前記半導体基板の下面に接する領域において、前記ドリフト領域よりもドーピング濃度の高い第1導電型のカソード領域を有し、且つ、前記カソード領域以外の領域に第2導電型のオーバーラップ領域を有し、前記半導体基板の上面において、予め定められた配列方向で前記トランジスタ部と並んで配置されたダイオード部と、
前記半導体基板の上方に配置されたエミッタ電極と、
前記半導体基板と前記エミッタ電極との間に設けられ、前記エミッタ電極と前記ダイオード部とを接続するためのコンタクトホールが設けられた層間絶縁膜と
を備え、
前記配列方向において、前記カソード領域は、前記エミッタ領域の端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記エミッタ領域の端部と前記カソード領域の端部との間において第1の長さで設けられ、
前記配列方向と直交する延伸方向において、前記カソード領域は、前記コンタクトホールの端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記コンタクトホールの端部と前記カソード領域の端部との間において第2の長さで設けられ、
前記第1の長さは、前記第2の長さよりも大きく、
前記半導体基板において、前記ダイオード部と前記延伸方向に並んで配置された、第2導電型のウェル領域を更に備え、
前記延伸方向において、前記オーバーラップ領域は、前記ウェル領域の端部と前記カソード領域の端部との間において第3の長さで設けられ、
前記第1の長さは、前記第3の長さの2倍以上である半導体装置。 - 前記ダイオード部は、前記半導体基板の上面において、前記延伸方向に長手を有する
請求項1から4のいずれか一項に記載の半導体装置。 - 前記半導体基板の上面側に設けられた上面側ライフタイム制御部を更に備え、
前記上面側ライフタイム制御部は、前記トランジスタ部のうち、前記ダイオード部に接する領域に設けられ、
前記第1の長さは、前記配列方向における前記トランジスタ部の端部から前記上面側ライフタイム制御部の端部までの長さよりも大きい
請求項1から5のいずれか一項に記載の半導体装置。 - 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の上面に接する領域に、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域を有するトランジスタ部と、
前記半導体基板の下面に接する領域において、前記ドリフト領域よりもドーピング濃度の高い第1導電型のカソード領域を有し、且つ、前記カソード領域以外の領域に第2導電型のオーバーラップ領域を有し、前記半導体基板の上面において、予め定められた配列方向で前記トランジスタ部と並んで配置されたダイオード部と、
前記半導体基板の上方に配置されたエミッタ電極と、
前記半導体基板と前記エミッタ電極との間に設けられ、前記エミッタ電極と前記ダイオード部とを接続するためのコンタクトホールが設けられた層間絶縁膜と
を備え、
前記配列方向において、前記カソード領域は、前記エミッタ領域の端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記エミッタ領域の端部と前記カソード領域の端部との間において第1の長さで設けられ、
前記配列方向と直交する延伸方向において、前記カソード領域は、前記コンタクトホールの端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記コンタクトホールの端部と前記カソード領域の端部との間において第2の長さで設けられ、
前記第1の長さは、前記第2の長さよりも大きく、
前記オーバーラップ領域の前記延伸方向における中心での前記第1の長さは、前記延伸方向における端部での前記第1の長さよりも小さい半導体装置。 - 前記トランジスタ部は、前記半導体基板の下面に接する領域において、第2導電型のコレクタ領域を有し、
前記配列方向における前記オーバーラップ領域は、前記コレクタ領域よりもドーピング濃度の高い部分を有する
請求項1から7のいずれか一項に記載の半導体装置。 - 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の上面に接する領域に、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域を有するトランジスタ部と、
前記半導体基板の下面に接する領域において、前記ドリフト領域よりもドーピング濃度の高い第1導電型のカソード領域を有し、且つ、前記カソード領域以外の領域に第2導電型のオーバーラップ領域を有し、前記半導体基板の上面において、予め定められた配列方向で前記トランジスタ部と並んで配置されたダイオード部と、
前記半導体基板の上方に配置されたエミッタ電極と、
前記半導体基板と前記エミッタ電極との間に設けられ、前記エミッタ電極と前記ダイオード部とを接続するためのコンタクトホールが設けられた層間絶縁膜と
を備え、
前記配列方向において、前記カソード領域は、前記エミッタ領域の端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記エミッタ領域の端部と前記カソード領域の端部との間において第1の長さで設けられ、
前記配列方向と直交する延伸方向において、前記カソード領域は、前記コンタクトホールの端部よりも前記ダイオード部の中心側に設けられ、前記オーバーラップ領域は、前記コンタクトホールの端部と前記カソード領域の端部との間において第2の長さで設けられ、
前記第1の長さは、前記第2の長さよりも大きく、
前記トランジスタ部は、前記半導体基板の下面に接する領域において、第2導電型のコレクタ領域を有し、
前記配列方向における前記オーバーラップ領域は、前記コレクタ領域よりも前記半導体基板の深さ方向における厚みが大きい厚部分を有する半導体装置。 - 第1導電型のドリフト領域を有する半導体基板と、
前記半導体基板の上面に接する領域に、前記ドリフト領域よりもドーピング濃度の高い第1導電型のエミッタ領域を有するトランジスタ部と、
前記半導体基板の下面に接する領域において、前記ドリフト領域よりもドーピング濃度の高い第1導電型のカソード領域を有し、前記半導体基板の上面において、予め定められた配列方向で前記トランジスタ部と並んで配置されたダイオード部と、
前記半導体基板の下面に接する領域において、前記カソード領域以外の領域に設けられた第2導電型の下面領域と
を備え、
前記下面領域は、上面視における端部において、前記半導体基板の深さ方向における厚みが、他の部分よりも大きい厚部分を有する半導体装置。 - 前記下面領域は、前記配列方向の前記端部において、前記厚部分を有する
請求項10に記載の半導体装置。 - 前記下面領域は、前記配列方向において前記カソード領域と接する前記端部において、前記厚部分を有する
請求項11に記載の半導体装置。 - 前記下面領域は、前記配列方向と直交する延伸方向の前記端部において、前記厚部分を有する
請求項10から12のいずれか一項に記載の半導体装置。 - 前記下面領域は、上面視における前記半導体基板の端部において、前記厚部分を有する
請求項10から13のいずれか一項に記載の半導体装置。 - 前記厚部分は、前記トランジスタ部に配置されている
請求項10から14のいずれか一項に記載の半導体装置。 - 前記厚部分は、前記ダイオード部に配置されている
請求項10から14のいずれか一項に記載の半導体装置。 - 前記厚部分のドーピング濃度は、前記下面領域の前記厚部分以外の部分のドーピング濃度よりも高い
請求項10から16のいずれか一項に記載の半導体装置。 - 前記ドリフト領域と、前記下面領域との間に設けられ、前記ドリフト領域よりもドーピング濃度の高いバッファ領域を更に備え、
前記ドリフト領域と、前記厚部分との距離が1μm以上である
請求項10から17のいずれか一項に記載の半導体装置。 - 前記ドリフト領域と、前記下面領域との間に設けられ、前記ドリフト領域よりもドーピング濃度の高いバッファ領域を更に備え、
前記バッファ領域は、高濃度領域と、前記高濃度領域と前記配列方向に並んでおり、前記高濃度領域よりもドーピング濃度の低い低濃度領域とを有し、
前記厚部分は、前記低濃度領域と重ならない位置に設けられている
請求項10から17のいずれか一項に記載の半導体装置。 - 前記配列方向において、前記低濃度領域が、前記厚部分よりも前記トランジスタ部の中央側に配置されている
請求項19に記載の半導体装置。 - 前記下面領域における第2導電型のドーパント濃度は、前記カソード領域における第1導電型のドーパント濃度よりも高く、
前記半導体基板の深さ方向において、前記下面領域は、前記カソード領域よりも厚い
請求項10から16のいずれか一項に記載の半導体装置。
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